I'm on a Mac too and I have the same problem with some titles giving the errors described above. I don't think I have ever seen the dialog where you can choose the correct title for a book. Could that functionality be incompatible with Mac and cause the process to crash?
Maybe an option could be added do disable this dialog and always choose the most likely option?

Yes you can:
option: to retrieve rejected titles in case no exact match is found - default= yes
You will find it in the config part of the plugin.

Do you no why the new (e)books are not good, correctly and completely filled out in calibre?

Example: When I take the (e)book Het Been In De IJssel
with ISBN: 9044622366
The date is not good and there is no Publisher and i get not a Bookcover anymore.

The problems are not with the normal books only the ebooks.

The order of the information is different for ebooks, and there is no direct tag for publisher or date.
Presuming the difference is consistent, I can make an adjustment on the binding method( ebook or not).
I will take a look en publish an update asap.

Sorry but not everything works in good order. Now I get the number of pages in when it`s publisht. Take the ebook Houvast - Linda Jansma and take the 10 digit isbn and you will see whats wrong. Paperback books are all oke. Not every ebook is wrong.

Sorry but not everything works in good order. Now I get the number of pages in when it`s publisht. Take the ebook Houvast - Linda Jansma and take the 10 digit isbn and you will see whats wrong. Paperback books are all oke. Not every ebook is wrong.

Because there are not tags at the website for publisher and publishing date,
we have to quess for the order of the information.
For a paperbook the publisher is named at the third item, but for an ebook it is (by default) the second item. However in some cases ( p.e. when pagecount is also mentioned, the publisher is the third item in the list.
For the publishing date it is the same.

Therefore, in case of an ebook, I check if "pagina" is part of the publishers name.
That will do for now, but there are more errors possible. So let me know.

The problem is almost away but when i take the 10 digit (13 digit too) isbn number of a ebook he can find covers for the book. The paperback book with the 10 or 13 digit number doesn`t have that problem.
Sorry for the bad english and i hope there is no problem that i type it also in Dutch.

The problem is almost away but when i take the 10 digit (13 digit too) isbn number of a ebook he can find covers for the book. The paperback book with the 10 or 13 digit number doesn`t have that problem.
Sorry for the bad english and i hope there is no problem that i type it also in Dutch.
.

I think in the config file you have chosen for covers from literatuurplein only.
Without using that option you get the cover from bol.
The isbn of Sophie Kinsella - isbn:9044338609 (no cover) is not available at literatuurplein
The same for the ebook of claudia de Breij.

Would it be possible to strip titles of the (eBook) suffix?
I have a lot of eBooks and they show up in Calibre as "title (eBook)" because of Bol.com plugin.
It would nicer if the (eBook) suffix would be stripped.